Incandescent electric lamp.



PATENTED NOV. 21, 1905.

R. & G. H. GEROW.

' INCANDESCBNT ELECTRIC LAMP.

APPLICATION FILED DEG-31, 1904.

ROYAL GEROW AND GEORGE HILLIARD GEROVV, OF NORTHPORT, CANADA.

INC'ANDESCENT ELECTRIC LAMP.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed, D mb r 31, 1904. Serial No. 239,220.

To a whom it may concern.-

Be it known that we, ROYAL GEROVV and GEORGE IIILLIARD GERow, of the village of North ort, in the county of Prince Edward, in the rovince of Ontario, Canada, have invented certain new and useful Improvements in Incandescent Electric Lamps, of which the following is the specification.

Our invention relates to improvements in incandescent electric lamps; and the object of the invention is to devise a lamp of this class in which the filament when worn or burned out may be restored by new filament, and thereby save the main body and base of the lamp, and consequently avoid throwing away the lamps after the filaments have been rendered useless through long use and it consists, essentially, of a base provided with areduced inner portion exteriorly threaded and a globe provided with the reduced portion having a sleeve attached thereto, which is interiorly threaded to fit the aforesaid reduced portion of the base, the said base being also provided with an orifice extending therethrough having a suitable valve and closingplugs and also an inwardly-extending stem provided with means at the inner end thereof for holding the filament, the parts being arranged and constructed in detail, as hereinafter more particularly explained.

Figure 1 is a sectional view of a lamp constructed in accordance with our invention. Fig. 2 is an enlarged sectional detail showing the means for holding the filament in the stem.

In the drawings like letters and figures of reference indicate corresponding parts in each figure.

A is the base of the lamp, and B the globe, which is made of glass. The base A is made mostly of a porcelain body A, provided with a metallic covering a, surrounding the major portion of the lamp and provided with any suitable means for connecting it to the socket, such as thread or groove.

The covering or casing a is metallic and is provided with a reduced inner portion a, which is exteriorly threaded, as indicated. The reduced outer portion of the body A is provided with a metal ring 0 as indicated.

The body A has an inwardly-extending stem A through the center of which extends the passageway 2. The stem A flares outwardly at the bottom at A and on each side of the passage-way 2, through the passage-ways 3 and 4 in the body, extend the circuit-wires 3 and 4.

5 is the filament, which extends into the orifices 3 and 4 forming a continuation of the passage-ways 3 and 4. The ends of the filament extend into the orifices 3 and 4 and are secured therein so as to abut the wires 3 and 4 by the set-screws 3 and 4;, respectively. The flaring portion A" is provided with reinforcing metal collars A", through which the screws 3 and A" pass, thereby giving them a firm hold.

6 is an orifice which extends through the base A, forming a continuation of the orifice 2, to which it is connected by the tapered portion 7, within which is located the con ical valve 8.

9 is a sleeve fitting in the orifice 6, suitably held therein and to which the outer end of the wire 4 is secured.

10 is a screw-plug which is fitted into the sleeve 9, as indicated.

The globe b is provided with a bead b at the inner and has suitably cemented or otherwise fastened around the open end the collar b, which is internally threaded outside of the bead, as indicated, in order that the globemay be screwed in place on the reduced threaded end a of the metallic casing a. 7

We preferably provide a rubber gasket B between the end of the collar b and the shoulder formed in the casing, so as to eflectually prevent any escape of air when the globe is securely held in place. I

In manufacturing our lamp the filament is first secured in the stem of the base, as hereinbefore described, and then the globe screwed in place. The plug 10 is removed and avacuum pump applied to the threaded sleeve and the interior of the globe rendered in vacuo, the valve 8 permitting of this and being drawn by suction down on its seat as soon as the vacuum-pump is removed. The plug 10 is then inserted in position for safety.

Should a lamp burn out, the globe B is unscrewed and the air let in and a new filament put in place, when the plug 10 may be re moved and the interior of the globe rendered in vacuo again. It will be seen by this means we are enabled to repair a lamp or render it as good as new again at a trifling expense-viz., the cost of the filamentwhichis an important desideratum.

What We claim as our invention is- 1. In an incandescent electric lamp, the combination With the base having a contracted stem provided with a central orifice the end of said stem being adapted to receive the ends of the filament and an extension-orifice in the base connected to the aforesaid orifice by a tapered portion, a conical valve located in said tapered portion and a removable plug closing the end of the extensionorifice.

2. In an incandescent electric lamp, the combination With the base having a stem provided With a central orifice and an extension-orifice in said base connected to the aforesaid orifice by a tapered portion, the conical valve located in such tapered portion, a screw-threaded sleeve fitting in the upper end of the extension-orifice, a screw-plug fitting in said sleeve, a metal ring fitting the outer end of the base and the Wires leading I from said ring and sleeve through the base and stem thereof, the filament held in the stem and being connected to the said Wires and the globe removably attached to the base, substantially as described.

3. In an incandescent electric lamp, the combination with a base having a central orifice and a filament dotachably connected to wires in the base, of a globe having a beaded neck, and a metallic collar extending over the said beaded neck and along the exterior of the globe, said collar being cemented below the head to the globe and having an extension above the bead screw-threaded and engaging a screw-thread on the base, substantially as described.

ROYAL GEROVV. GEORGE I-IILLIARD GEROVV.

itnesses A. S. OsBoRNE, L. SNIDER. 

